Question

There are 7 different books each having 10 copies. The number of ways in which a selection can be made from them is :

• A. $11^7$
• B. $7^{11}-1$
• C. $11^7-1$
• D. $7^{11}$

Answer 1

Answer: (C)

Correct answer is (c) $11^7-1$